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Legionnaires Disease

Legionnaires Disease Caused By Water Temperature

Legionnaires Disease is a potentially deadly disease which in recent times has been reported in NZ. It is a potentially fatal type of pneumonia and can be found within our hot water systems.

How to stop it? Legionella bacteria can grow in water temperatures of 20-45°C. They thrive at temperatures of 32-44°C but can't live at 60°C or higher. The building code requires hot water systems to be capable of being controlled to prevent the growth of Legionella bacteria. To achieve this the storage water heater or hot water cylinder thermostat must be set to a minimum temperature of 60°C.

Tip: Never adjust the temperature in your hot water cylinder below 60°C in the hopes of saving electricity.